Indoor Air Quality Wiring Diagrams; Power & Reset Options; Setup & Testing; Installer Setup Wizard - Aprilaire 8840 Safety & Installation Instructions

INDOOR AIR QUALITY WIRING DIAGRAMS

FIGURE 18 – INDOOR AIR QUALITY WIRING WITH SEPARATE TRANSFORMERS
HUM
DHnc
DH com
DH no
VNT
EAC
FIGURE 19 – INDOOR AIR QUALITY WIRING WITH A SINGLE TRANSFORMER
HUM
DH nc
DH com
DH no
VNT
EAC
10
TRANSFORMER
HUMIDIFIER
DEHUMIDIFIER
TRANSFORMER
NORMALLY
CLOSED DAMPER
TRANSFORMER
PILOT RELAY FOR
120 VAC TO EAC
HUMIDIFIER
TRANSFORMER
DEHUMIDIFIER
NORMALLY
CLOSED DAMPER
PILOT RELAY FOR
120 VAC TO EAC
The equipment control module is powered from 24VAC The thermostat is powered from the
equipment control module In the case of power loss the thermostat will maintain the clock
for 24 hours The thermostat has a memory backup that saves the thermostat settings in
case of power interruption
The factory reset is located in the Installer Tools option of the Installer Menu See Installer
System Settings section for details

INSTALLER SETUP WIZARD

The first time the thermostat is powered up (or after a factory reset) it will enter the Installer
Setup Wizard All installer settings can be set in this process The installer settings are also
accessible in the MENU by pressing the Contractor Info button for 10 seconds
Import USB settings will be the first screen that you see (the button will be grayed out until
a USB drive is inserted)
• If you have a USB drive with installer
setup files on it, insert it into the USB
connector (on the lower left corner)
to import a file.
90-1721
• Or press Skip to proceed with the
Installer Setup Wizard
NOTE: Installer setup files can be
created from the Export Setup option
found under Installer Menu > Installer
Tools > Export Setup

HVAC INSTALLER SYSTEM SETTINGS TABLES

The following tables contain the system settings and their details Default settings are shown
in bold Some settings are only available dependent upon the value of other settings
TABLE 1 – GENERAL SYSTEM SETTINGS
System setting
Connection Type
Installer
Temperature Scale
Contractor
Information Input
90-1722
POWER & RESET OPTIONS
SETUP & TESTING
Description
Selects if the thermostat connects with an
automation system or an AprilAire account
This selection only effects the installer setup
menus
Enter contractor's contact information
Factory default setting
(bold) and setting range
Automation System
AprilAire Cloud
Fahrenheit
Celsius
Company, Phone, Email, Web
11